User blog comment:Dante-Must-Die-Mode/What The Heaven And Hell?: Nero/@comment-967403-20150329222022/@comment-6769189-20150331005901

Alastors handle renders similarities between swords somwhat irrelvant. Alastor and Ifrit have a dragon head on them, but aren't related. Yamato has a dragon on the pommel, but isn't related to Alastor or Ifrit.

Spardas requirement for full use is the ability to love and resonate. No blood relation necessary. Therefore, a previous/blood connection to Yamato isn't necessary to do things with it.

Yes, I am aware Dante had already activated DT, but he needs a Devil Arm to sustain/activate it. We know Yamato existed before Vergil, at hasn't been stated to be an embodiment of his power the same way as Rebellion. It is entirely possible and reasonable one can resonate with another Devil Arm and DT for the first time with it. What is to say that If Dante had Beowulf his entire life he couldn't he draw on its energy to DT for the first time?

If Sanctus calling Yamato to himself has nothing to do with the Savior. The yellow glow only happens when traveling through the Savior. After Yamato had passed through it was glowing blue/purple. The fight with Nero and Dante would have been so much easier if he could levitate anything he wanted. Let's also remember that Vergil called Beowulf to himself and Dante did the same with Cerberus. Weapons they had no previous connections to.